I like getting up very early in summer. The morning air is so good .
A. to breathe
B. to be breathed
C. breathing
D. being breathed
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(答案→)A. to breathe
B. to be breathed
C. breathing
D. being breathed
解析:考查不定式用法。本题的不定式与形容词连用对句子的主语进行修饰说明。使用主动语态表示被动的含义。如The question is easy to answer。句意:我很喜欢在夏天早起,早晨的空气呼吸起来感觉很好。